<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
</head>
<body>
    <script>
        // 日期检测    2017-/.,11-/.,16
        var str = '2016-02-01 3 04:23:20'
        var reg = /[1-2][0-9]{1,3}-[0-1][1-9]-[1-3][0-9] /
    </script>
</body>
</html>